Keigo Higashino's " Malice " was the fourth case in the Kaga Detective Series. The other three cases were: 1 " The Sacrifice of Suspect X " was the first case of Kaga Kyichiro. It was about a mathematical genius who planned a perfect murder to save his wife. 2 " White Night Walk ": A case investigated by Kaga Kyichiro and female detective Yukiho. It tells the secrets and love-hate entanglements between two teenagers. 3 " Secret ": A case investigated by Kaga Kyichiro and another detective, Misumi Mikoto. It tells the story of a seemingly ordinary family dispute and conspiracy.